Sewer



June 23, 1936. BIETZ 2,045,514

SEWER Filed March 20, 1955 Y 2 Sheets-Sheet l BY m ATTORNEY v ZNVENTORJune2351936. L. BIETZ SEWER 2 Sheets-Sheet 2 I Filed Mafoh 20, 1955 ATTORN EY Patented June 23, 1936 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to conduits especially adapted for theconstruction of sewers and the like, and has for the primary object theprovision of conduit units so constructed that interfitting joints areprovided therebetween and each composed of separable walls havinginterfitting or locking joints therebetween, thereby providing aknockdown unit which may be readily assembled when laying orconstructing a sewer rendering the handling of the units comparativelyeasy.

With these and other objects in view, this invention consists in certainnovel features of construction, combination and arrangement of parts tobe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which Figure 1is an end elevation illustrating a conduit unit constructed inaccordance with my invention.

Figure 2 is a sectional 2-2 of Figure 1.

Figure 3 is a sectional view taken on the line view taken on the line 733 of Figure 2.

Figure 4 is a sectional view taken on the line 4-4 of Figure 1.

Figure 5 is a perspective view illustrating the top wall of a conduitunit.

Figure 6 is a perspective view illustrating the bottom Wall of a conduitunit.

Figure '7 is a perspective view illustrating one of the side walls of aconduit unit.

Referring in detail to the drawings, the numeral I indicates a conduitconstructed of reinforced concrete or similar material and is composedof a series of units arranged in endwise relation when constructing a.sewer or like device. The units interfit with one another when assembledto reduce to a minimum leakage between the units. E-ach unit is composedof top and bottom walls 2 and 3 and side walls 4. The walls are providedwith inner longitudinally arrange-d thickened or stepped faces 5 so thatwhen said walls are assembled the faces thereof interfit and therebyreduce leakage between the walls to a minimum. The faces 5 on the units2 and 3, inward of the edges of said faces, (a distance equalling thatof the thickness of the reduced edges of the side walls 4) are formedwith ribs 5 whose outer walls are straight but whose inner orconfronting walls are angularly .dis-

posed. The angle faces of these ribs prevent the formation of anystraight corners in the conduit in which dirt may accumulate and theirimportance will, it is thought, be considered. The inner faces of thetop and bottom walls are recessed, as shown at 6, to increase the areaof the bore of the unit so that a greater flow of water through the unitmay be accommodated.

One end of each unit is formed with an extension 1, the faces of whichare angularly related while the opposite end of the unit is recessedwith the walls thereof angularly related so that the extension of oneunit may fit tightly in a recess of the adjacent unit.

The side walls above the lower edges are provided with openings orpassages 9 for the purpose of permitting water which may accumulateabout the unit to pass into the bore thereof. The arrangement of theopenings in the side walls is such that the passage or flow of waterthrough the conduit unit will draw accumulated water from the exteriorof the unit into the passage or bore thereof.

The walls have embedded therein reinforcing bars l0, which bars arepreferably arranged longitudinally of said walls for the purpose ofproviding thereto maximum strength.

Having thus described the invention, I claim:

A conduit comprising a unit including separable flat walls each havingstepped faces, said faces of the top and bottom walls adapted to fit thefaces of the side walls when said walls are assembled and which side andbottom walls are respectively of the same width and length andthickness, said side walls having water or sewage inlet openingsadjacent to the longitudinal edges thereof, said walls at one end of theunit being cut away to form a recess having angularly disposed walls,said walls at the other end of the unit being cut away to form anextension having angularly related faces to fit the walls of a recess ofan adjacent unit, said top and bottom walls having longitudinallyextending integral ribs adjacent their stepped faces to receive the sidewalls thereagainst, and the outer faces of said ribs being beveled toprevent the formation of debris in the corners of the conduit and theLUTHER BIETZ.

